:root {
  --bg: #ffffff;
  --fg: #1f2933;
  --muted: #5f6b7a;
  --accent: #1a7f5a;
  --border: #e4e7eb;
  --max: 760px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111418; --fg: #e4e7eb; --muted: #9aa5b1; --accent: #3fbf8f; --border: #2a3038; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--fg);
}
header, main, footer { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
header .brand { font-weight: 700; font-size: 1.2rem; color: var(--fg); text-decoration: none; }
nav a { margin-left: 20px; color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--accent); }
main { padding-top: 32px; padding-bottom: 48px; }
h1 { font-size: 2rem; margin-top: 0; }
h2 { margin-top: 2rem; font-size: 1.3rem; }
a { color: var(--accent); }
.muted { color: var(--muted); font-size: 0.9rem; }
.notice { border-left: 4px solid var(--accent); padding: 8px 16px; background: rgba(26,127,90,0.08); }
footer { border-top: 1px solid var(--border); padding-top: 16px; padding-bottom: 32px; color: var(--muted); font-size: 0.85rem; }